I know you mean "Since he is blind" and that is bullshit, blind people do not see, not even blackness, depending on which type of blindness. If there is something wrong with the eyes, yes everything will be black but you can get a device with which you can see via your tongue. If this dude is born with blindness and nothing is wrong with his eyes, it is most likely that his visual cortex is fucked up and he won't be able to perceive, not even blackness. Just not. It just does not exist.

So, in one of these cases you are a retard, and in the other you are right.